# CVE-2018-16323: Information disclosure in n/a

> Attackers can leak sensitive memory data by processing malicious XBM files with uninitialized variables in ImageMagick.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 1 Sep 2018
- **Updated:** 5 Aug 2024
- **Also known as:** DEBIAN-CVE-2018-16323, GHSA-q2cj-g3jg-cp49, UBUNTU-CVE-2018-16323

## What is CVE-2018-16323?

CVE-2018-16323 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 1 Sep 2018. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

ReadXBMImage in coders/xbm.c in ImageMagick before 7.0.8-9 leaves data uninitialized when processing an XBM file that has a negative pixel value. If the affected code is used as a library loaded into a process that includes sensitive information, that information sometimes can be leaked via the image data.

Weakness: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2018-16323?

It affects 2 products.


Products: Canonical Ubuntu Linux, Imagemagick Imagemagick.

## How do I fix CVE-2018-16323?

Upgrade to a fixed version.

## Is CVE-2018-16323 being exploited?

There is no known exploitation of CVE-2018-16323 in the wild and no public exploit code.

Public exploit code:

- Tool for CVE-2018-16323 (github_poc): https://github.com/ttffdd/XBadManners
- ImageMagick - Memory Leak (exploitdb)

## Other vulnerabilities in Canonical Ubuntu Linux

- [CVE-2020-11651](https://insights.sbomify.com/CVE-2020-11651/): SaltStack Salt Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2020-7247](https://insights.sbomify.com/CVE-2020-7247/): OpenSMTPD Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2019-16928](https://insights.sbomify.com/CVE-2019-16928/): Exim Out-of-bounds Write (critical 9.8, exploited in the wild)
- [CVE-2018-6789](https://insights.sbomify.com/CVE-2018-6789/): Exim Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2015-2590](https://insights.sbomify.com/CVE-2015-2590/): Oracle Java SE and Java SE Embedded Remote Code Execution (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-16323 and fix it if it is affected.

What it is: CVE-2018-16323 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 1 Sep 2018. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2018-16323 in the wild and no public exploit code.

Affected product: Canonical Ubuntu Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2018-16323/ (Markdown: https://insights.sbomify.com/CVE-2018-16323/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-16323
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-16323
- OSV: https://osv.dev/vulnerability/CVE-2018-16323

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-16323/
Summaries are generated and may contain mistakes; the official description above is the record.